Mercurial > hg > early-roguelike
annotate rogue3/chase.c @ 262:c7c6c5a7d840
UltraRogue: fix a segfault related to restoring monsters.
The functions for restoring saved games failed to properly correct the
t_chasee pointer of monsters chasing the player. Such monsters would
attempt to chase NULL instead, with predictable results.
author | John "Elwin" Edwards |
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date | Tue, 14 Feb 2017 20:42:33 -0500 |
parents | d9e44e18eeec |
children |
rev | line source |
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0
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1 /* |
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2 * Code for one object to chase another |
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3 * |
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4 * @(#)chase.c 3.17 (Berkeley) 6/15/81 |
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5 * |
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6 * Rogue: Exploring the Dungeons of Doom |
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7 * Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman |
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8 * All rights reserved. |
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9 * |
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10 * See the file LICENSE.TXT for full copyright and licensing information. |
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11 */ |
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12 |
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13 #include "curses.h" |
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14 #include "rogue.h" |
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15 |
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16 coord ch_ret; /* Where chasing takes you */ |
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17 |
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18 /* |
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19 * runners: |
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20 * Make all the running monsters move. |
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21 */ |
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22 |
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23 void |
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24 runners() |
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25 { |
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26 struct linked_list *item; |
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27 struct thing *tp; |
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28 |
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29 for (item = mlist; item != NULL;) |
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30 { |
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31 tp = (struct thing *) ldata(item); |
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32 item = next(item); |
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33 if (off(*tp, ISHELD) && on(*tp, ISRUN)) |
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34 { |
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35 if (off(*tp, ISSLOW) || tp->t_turn) |
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36 if (do_chase(tp) == -1) |
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37 continue; |
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38 if (on(*tp, ISHASTE)) |
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39 if (do_chase(tp) == -1) |
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40 continue; |
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41 tp->t_turn ^= TRUE; |
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42 } |
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43 } |
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44 } |
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45 |
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46 /* |
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47 * do_chase: |
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48 * Make one thing chase another. |
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49 */ |
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50 |
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51 int |
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52 do_chase(struct thing *th) |
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53 { |
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54 struct room *rer, *ree; /* room of chaser, room of chasee */ |
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55 int mindist = 32767, i, dist; |
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56 int stoprun = FALSE; /* TRUE means we are there */ |
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57 int sch; |
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58 coord this; /* Temporary destination for chaser */ |
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59 |
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60 rer = roomin(&th->t_pos); /* Find room of chaser */ |
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61 ree = roomin(th->t_dest); /* Find room of chasee */ |
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62 /* |
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63 * We don't count doors as inside rooms for this routine |
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64 */ |
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65 if (mvwinch(stdscr, th->t_pos.y, th->t_pos.x) == DOOR) |
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66 rer = NULL; |
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67 this = *th->t_dest; |
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68 /* |
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69 * If the object of our desire is in a different room, |
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70 * than we are and we ar not in a corridor, run to the |
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71 * door nearest to our goal. |
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72 */ |
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73 if (rer != NULL && rer != ree) |
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74 for (i = 0; i < rer->r_nexits; i++) /* loop through doors */ |
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75 { |
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76 dist = DISTANCE(th->t_dest->y, th->t_dest->x, |
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77 rer->r_exit[i].y, rer->r_exit[i].x); |
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78 if (dist < mindist) /* minimize distance */ |
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79 { |
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80 this = rer->r_exit[i]; |
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81 mindist = dist; |
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82 } |
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83 } |
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84 /* |
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85 * this now contains what we want to run to this time |
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86 * so we run to it. If we hit it we either want to fight it |
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87 * or stop running |
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88 */ |
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89 if (!chase(th, &this)) |
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90 { |
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91 if (ce(this, hero)) |
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92 { |
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93 return( attack(th) ); |
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94 } |
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95 else if (th->t_type != 'F') |
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96 stoprun = TRUE; |
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97 } |
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98 else if (th->t_type == 'F') |
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99 return(0); |
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100 mvwaddch(cw, th->t_pos.y, th->t_pos.x, th->t_oldch); |
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101 sch = mvwinch(cw, ch_ret.y, ch_ret.x); |
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102 if (rer != NULL && (rer->r_flags & ISDARK) && sch == FLOOR |
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103 && DISTANCE(ch_ret.y, ch_ret.x, th->t_pos.y, th->t_pos.x) < 3 |
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104 && off(player, ISBLIND)) |
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105 th->t_oldch = ' '; |
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106 else |
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107 th->t_oldch = sch; |
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108 |
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109 if (cansee(unc(ch_ret)) && !on(*th, ISINVIS)) |
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110 mvwaddch(cw, ch_ret.y, ch_ret.x, th->t_type); |
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111 mvwaddch(mw, th->t_pos.y, th->t_pos.x, ' '); |
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112 mvwaddch(mw, ch_ret.y, ch_ret.x, th->t_type); |
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113 th->t_pos = ch_ret; |
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114 /* |
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115 * And stop running if need be |
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116 */ |
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117 if (stoprun && ce(th->t_pos, *(th->t_dest))) |
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118 th->t_flags &= ~ISRUN; |
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119 |
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120 return(0); |
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121 } |
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122 |
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123 /* |
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124 * runto: |
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125 * Set a mosnter running after something |
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126 * or stop it from running (for when it dies) |
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127 */ |
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128 |
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129 void |
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130 runto(coord *runner, coord *spot) |
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131 { |
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132 struct linked_list *item; |
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133 struct thing *tp; |
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134 |
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135 /* |
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136 * If we couldn't find him, something is funny |
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137 */ |
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138 if ((item = find_mons(runner->y, runner->x)) == NULL) |
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139 { |
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140 msg("CHASER '%s'", unctrl(winat(runner->y, runner->x))); |
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141 return; |
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142 } |
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143 tp = (struct thing *) ldata(item); |
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144 /* |
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145 * Start the beastie running |
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146 */ |
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147 tp->t_dest = spot; |
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148 tp->t_flags |= ISRUN; |
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149 tp->t_flags &= ~ISHELD; |
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150 } |
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151 |
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152 /* |
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153 * chase: |
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154 * Find the spot for the chaser(er) to move closer to the |
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155 * chasee(ee). Returns TRUE if we want to keep on chasing later |
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156 * FALSE if we reach the goal. |
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157 */ |
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158 |
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159 int |
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160 chase(struct thing *tp, coord *ee) |
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161 { |
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162 int x, y; |
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163 int dist, thisdist; |
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164 struct linked_list *item; |
180 | 165 struct object *obj = NULL; |
0
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166 coord *er = &tp->t_pos; |
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167 int ch; |
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168 |
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169 /* |
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170 * If the thing is confused, let it move randomly. Invisible |
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171 * Stalkers are slightly confused all of the time, and bats are |
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172 * quite confused all the time |
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173 */ |
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174 if ((on(*tp, ISHUH) && rnd(10) < 8) || (tp->t_type == 'I' && rnd(100) < 20) |
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175 || (tp->t_type == 'B' && rnd(100) < 50)) |
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176 { |
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177 /* |
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178 * get a valid random move |
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179 */ |
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180 ch_ret = *rndmove(tp); |
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181 dist = DISTANCE(ch_ret.y, ch_ret.x, ee->y, ee->x); |
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182 /* |
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183 * Small chance that it will become un-confused |
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184 */ |
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185 if (rnd(1000) < 50) |
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186 tp->t_flags &= ~ISHUH; |
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187 } |
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188 /* |
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189 * Otherwise, find the empty spot next to the chaser that is |
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190 * closest to the chasee. |
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191 */ |
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192 else |
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193 { |
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194 int ey, ex; |
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195 /* |
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196 * This will eventually hold where we move to get closer |
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197 * If we can't find an empty spot, we stay where we are. |
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198 */ |
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199 dist = DISTANCE(er->y, er->x, ee->y, ee->x); |
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200 ch_ret = *er; |
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201 |
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202 ey = er->y + 1; |
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203 ex = er->x + 1; |
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204 for (x = er->x - 1; x <= ex; x++) |
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205 for (y = er->y - 1; y <= ey; y++) |
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206 { |
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207 coord tryp; |
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208 |
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209 tryp.x = x; |
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210 tryp.y = y; |
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211 if (!diag_ok(er, &tryp)) |
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212 continue; |
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213 ch = winat(y, x); |
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214 if (step_ok(ch)) |
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215 { |
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216 /* |
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217 * If it is a scroll, it might be a scare monster scroll |
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218 * so we need to look it up to see what type it is. |
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219 */ |
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220 if (ch == SCROLL) |
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221 { |
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222 for (item = lvl_obj; item != NULL; item = next(item)) |
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223 { |
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224 obj = (struct object *) ldata(item); |
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225 if (y == obj->o_pos.y && x == obj->o_pos.x) |
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226 break; |
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227 } |
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228 if (item != NULL && obj->o_which == S_SCARE) |
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229 continue; |
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230 } |
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231 /* |
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232 * If we didn't find any scrolls at this place or it |
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233 * wasn't a scare scroll, then this place counts |
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234 */ |
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235 thisdist = DISTANCE(y, x, ee->y, ee->x); |
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236 if (thisdist < dist) |
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237 { |
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238 ch_ret = tryp; |
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239 dist = thisdist; |
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240 } |
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241 } |
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242 } |
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243 } |
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244 return (dist != 0); |
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245 } |
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246 |
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247 /* |
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248 * roomin: |
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249 * Find what room some coordinates are in. NULL means they aren't |
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250 * in any room. |
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251 */ |
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252 |
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253 struct room * |
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254 roomin(coord *cp) |
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255 { |
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256 struct room *rp; |
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257 |
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258 for (rp = rooms; rp <= &rooms[MAXROOMS-1]; rp++) |
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259 if (inroom(rp, cp)) |
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260 return rp; |
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261 return NULL; |
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262 } |
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263 |
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264 /* |
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265 * find_mons: |
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266 * Find the monster from his corrdinates |
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267 */ |
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268 |
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269 struct linked_list * |
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270 find_mons(int y, int x) |
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271 { |
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272 struct linked_list *item; |
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273 struct thing *th; |
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274 |
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275 for (item = mlist; item != NULL; item = next(item)) |
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276 { |
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277 th = (struct thing *) ldata(item); |
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278 if (th->t_pos.y == y && th->t_pos.x == x) |
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279 return item; |
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280 } |
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281 return NULL; |
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282 } |
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283 |
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284 /* |
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285 * diag_ok: |
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286 * Check to see if the move is legal if it is diagonal |
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287 */ |
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288 |
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289 int |
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290 diag_ok(coord *sp, coord *ep) |
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291 { |
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292 if (ep->x == sp->x || ep->y == sp->y) |
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293 return TRUE; |
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294 return (step_ok(mvinch(ep->y, sp->x)) && step_ok(mvinch(sp->y, ep->x))); |
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295 } |
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296 |
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297 /* |
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298 * cansee: |
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299 * returns true if the hero can see a certain coordinate. |
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300 */ |
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301 |
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302 int |
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303 cansee(int y, int x) |
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304 { |
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305 struct room *rer; |
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306 coord tp; |
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307 |
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308 if (on(player, ISBLIND)) |
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309 return FALSE; |
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310 tp.y = y; |
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311 tp.x = x; |
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312 rer = roomin(&tp); |
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313 /* |
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314 * We can only see if the hero in the same room as |
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315 * the coordinate and the room is lit or if it is close. |
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316 */ |
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317 return (rer != NULL && rer == roomin(&hero) && !(rer->r_flags&ISDARK)) || |
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318 DISTANCE(y, x, hero.y, hero.x) < 3; |
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319 } |